Pilot-scale Research on Treatment of Micro-polluted Source Water by Biological Contact Oxidation /Air Flotation Process

A pilot-scale test with influx of 20 m~3/h based on biological contact oxidation /air flotation process was carried out for treating micro-polluted source water.The influence of air-water ratio,HRT(hydraulic retention time),media-filling rate for biological contact oxidation tank and dosage of flocculating agent,surface loading for flotation tank on pollutants removal was studied.The results show that when the air-water ratio is 1.0,HRT is 60 min,media-filling rate is 40%,the dosage of flocculating agent is 30 mg/L and surface loading is 7.5 m~3/(m~2·h),pollutants removal effects are excellent with removal rate for COD_(Mn),which can be up to 23%,its effluent NH_3-N and TP can achieve standards for II-class criteria of surface water.